Tht norrls peters co



(No Model.)

4 Sheets-Sheet 1.

R. P. EMMERI'CH & F. VONDERLEHR.

STONE GRINDING MACHINE.

I Patented May 7, 1895.

(N0 Modl.) 4 Sheets-Sheet 2; R. F. EMMERICH & P. VO NDERLEHR. STONEGRINDING MACHINE.

NO. 538,824. Patented May 7, 1895.

5 Pink: no. motouma. WASNINGYCM n c 4 Sheets-Sheet 3. R. F. EMMERIOH &P. VONDERLEHR.

STONE GRINDING MACHINE.

Patented May 7, 1895.

(No Model.

(No Model.) 4 Sheets-Sheet 4. R. F. EMMERIGH & P. VONDERLEHR. STONEGRINDING MACHINE.

No. 538,824; Patented May 7, 1895.

. NITED STATES PATENT Enron.

RUDOLPH F. EM-MERICH AND FREDERICK VONDERLEHR, OF NEW YORK, N. Y.

STONE-GRlNDl-NG MACHINE.

5PEGIFIGATION'forrning part of Letters Patent No. 538,824, dated May '7,1895.

A Application filed December 1,1394- Serial No. 530,598. (No model.)

To aZZ whom it may concern:

Be it known that we, RUDOLPH F. EMMERICH and FREDERICK VONDERLEHR,b0thof the city and county of New York,in the State of New York, haveinvented a new and useful Improvement in Stone-Grinding Machines, ofwhich the following is a specification.

Our invention consists of an improvement in stone grinding machines andrelates more particularly to machines for grinding the faces oflithographic stones.

The object of our invention is to provide a machine which shall be verysimple in construction, yet positive in action and in which the severalparts may be quickly and accurately adj usted.-

A further object is to provide a sand feeding device for supplying sandin the desired quantity at intervals onto the face of the stone that isbeing ground.

A practical embodiment of our invention is represented in theaccompanying drawings, in which Figure 1 is a view in side elevation ofthe machine. Fig. 2 is a top plan view of the same. Fig. 3 is a frontview with the sand feeding device removed. Fig. 4. is a vertical centralsection through the machine from front to rear. Fig. 5 is an enlargedside view of the grinding-plate and its holder. Fig. 6 is a top planview of the same. Fig. 7 is a cross-section on the line 00 a: of Fig. 6.Fig.8 is a cross-section on the line y y of Fig. 6. Fig. 9 is a verticalcentral section through the sand-feeding hopper, showing some of theoperating parts in side elevation; and Fig. 10 is a transverse verticalsection through the sandfeeding device. 7

The frame work of the machine is constructed as follows: A designatesthe base and from its rear portion aback supportB extends upwardly andis brought forward a sufficient distance to form a suitable support forthe upper working parts of the machine. This back support B isreinforced, to strengthen it, by two arched side supports B, B which aresocured at their upper ends to the back sup port and at their lower endsto laterally extended portions a, a of the base A. This arrangementmakes a very strong construction and one which is out of the way of theoperating parts.

The basin in which the stone supporting table is located is denoted by Oand it rests at its rear upon the base A and its forwardly extendingportion is supported upon suitable uprights c, c. Any suitable means maybe used to convey the surplus water out of the basin G.

D designates the main driving shaft which extends horizontally throughthe base A of the machine and is provided at its rear end with suitabledriving and loose pulleys d,d forimparting motion thereto. Thedriveshaft is further provided at its forward end outside the base A with abevel gear d which meshes with a gear 6 on the table supporting shaft E.This table supporting shaft E is provided at its upper portion with astone supporting table F, which is located within the basin 0 and isprovided with suitable clamping piecesfif, &c., for fastening the stonesecurely thereon. The shaft E is mounted in an adjustable bearing Ghaving upper and lower branches g, g. These branches support the shaftabove and below the angle gear e. The base of the bearing G is providedwith elongated slots curved concentrically with the main drive shaft-Dthrough which pass locking bolts g By this arrangement the bearing, andthereby the table shaft and table, can be adjusted so as to get thestone on the table perfectly horizontal.

The shaft which supports the grinding plate or rubber is denoted by Hand it is mounted in suit-able bearings h, h which are secured to theface of the back support B. The shaft H is rotated in an oppositedirection from the table supporting shaft E in the following manner: Themain drive shaft D is provided with a bevel gear (:1 which meshes with abevel gear t' on the lower end of an oblique shaft I. The upper end ofthe oblique shaft I is provided with a bevel gear 7;, which meshes witha gear h on the vertical shaft H. This gear 71. has a feather and grooveconnection with the shaft H so that the said shaft may be raised andlowered without raising and lowering the said gear.

The shaft H is mounted so that its longitudinal axis is out ofalignmentwith the table supporting shaft E, preferably to the rear ofsaidtable supporting shaft, so that the table in its rotary movementpresents constantly a new surface to the rotary grinding plate in a patharound the axial line of the table supporting shaft.

The oblique shaft 1 is mounted on the back support-B in suitablebearings i 2' which are secured to the back support. The relative sizeof the different bevel gears heretofore mentioned may be varied toobtain the desired speed of rotation of the different shafts.

The grinding plate holder K is secured firmly to the lower end of theshaft H so as to rotate therewith. It is preferably screwed onto thelower end of the shaft.

L designates the grinding plate or rubber and it is secured to theholder K in the following manner: The grinding plate at its centralportion is provided with a pair of lugs Z, Z which coincide with a pairof lugs 7c, 75' on the grinding plate holder K. Pins 1 ,1 secure thelugs Z and 7c and Z'and together, so that the grinding plate is pivotedto the holder at this point. The grinding plate is further secured tothe holder so that its outer ends may be depressed or raised, as may bedesired, in the following manner: The grinding plate is provided withlugs or .ears Z, Z to which is pivotally attached the head of a screwbolt M, the screw threaded portion of the said bolt extending upwardlythrough suitable openings in the opposite ends of the holder K.Adjusting nuts m, m have a screw threaded engagement with the bolt Mupon opposite sides of the holder K, so that as the adjusting nuts arescrewed downwardly the end of the grinding plate is drawn upwardlytoward the holder K and as the adjusting nuts are unscrewed, the end ofthe grinding plate is forced downwardly away from the said holder. Thegrinding plate is widest at its ends and is made gradually narrower asit approaches its operating shaft, so that the portion of thelithographic stone which is in proximity to the central part of thegrinding plate will not beground more than the portions of the stonewhich are toward the end of the grinding plate.

We provide the following device for preventing the sand and water whichis directed onto the surface of the stone being ground from being thrownoff the stone by the advance edge of the grinding plate. The grindingplateis provided with two uprising ears Z, Z uprising from the grindingplate near its edge and spaced some distance apart. To these ears wesecure aguard or shield N, which preferably extends from the outer endof the grinding plate a considerable distance toward its center and lapsover the edge of the grinding plate and extends downwardly into closeproximity to the face of the stone being treated. This guard N isprovided with a longitudinal stripn which is secured to its inner edge,which strip enters suitable sockets 0 in adjustable arms 0 which areclamped, at their inner ends, to the cars Z, Z by means of bolts 0. Bythis means the free ends of the arms 0 are raised and lowered, therebyregulating the distance between the lower edge of the guard N and theface of the stone being ground. We preferably provide two of theseguards N along the advancing edges of the grinding plate and they willcause the sand and water to be thrown back onto the face of the stone,instead of being thrown away from it.

The grinding plate is raised from and lowered onto the face of the stonein the following manner: We locate a rack bar P upon the shaft H, thetop of said rack bar engaging the shoulder h thereon, so that as therack bar P is raised, the shaft will be raised also. Within the lowerbearing h, we secure a pinion 19 which engages the teeth on the rack P.This pinion is operated by a pinion wheel 19 upon the exterior of thehearing which engages a worm 19 upon the inner end of a rod f. This rod19 is mounted at its inner end in a suitable bearing piece 19 and isfurther supported by a bearingp at the end of an arm 29', extendingoutwardly from the hearing h. The rod 19 has a suitable handle 13 at itsouter end for convenience in turning the said rod, whereby the shaft Hand its grinding plate L is raised and lowered.

The mechanism for feeding sand onto the face of the stone is constructedas follows: A bracket Q extends outwardly from the back support B and,at its outer end, is provided a sand hopper (1 upon a suitable shaft gwhich extends transversely through the hopper. This shaft is secure inthe bracket Q against rotation.

The hopper q is operated in the following manner: We secure a worm R bya feather and groove connection upon the shaft I-I between the rack Pand the upper bearing 71. This worm engages a pinion 0', whichis'mounted upon across shaft 1" which, in turn, is mounted to rotate inthe bracket Q. This shaft is further provided with a cam having a groover in which runs a guide roller upon the lower arm 3 of a two armed leverS, which is pivoted upon the bracket Q. The upper arm 5' of this leveris provided with an elongated slot 5 therein and one end of a connectingrod T is secured to the arm .9 at any required point along the saidelongated slot, so as to adjust the throw of the said connecting rod.The other end of the rod T is connected to a crank arm t which rotatesupon the shaft (1 as a pivot and is secured to swing with the hopper (1As thus constructed, the rotation of the shaft H, by means of its wormand gear connection, will rotate the cam and thereby vibrate the twoarmed lever S which will, in turn, by means of its connecting rod T,swing the hopper to and fro upon its pivotal shaft g, causing its spoutg to pass back and forth from the outer end of the stone being treatedto a point near its center. The worm and gear connection may be so timedthat the hopper will be swung back and forth over the face of the stoneevery third time that the shaft H revolves, or at any desired number :ofrevolutions; also IIO the swing of the hopper may be adjusted for largeror smaller stones, by means of the elongated slot in the lever S, asbefore described.

The sand is allowed to escape only while the hopper is being caused toswing across the face of the stone being treated in the followingmanner: A door U is fitted to close the open end of the spout g of thehopper. This door is pivoted to swing toward and away from the mouthofthe spout at v in a suitable lug or bracket V secured to the spoutnear its lower end. The doorU has an arm uextended laterally therefromand to the free end of the said arm is secured the lower end of a rod W,which extends upwardly to a point near the pivotal shaft q and is.supported in. sliding adjustment in a suitable bearing of on the hopperq. The rod V is normally heldraised and the door U closed by means of acoil spring to which extends between the bearing g and a shoulder to onthe rod,.the spring having an upward pressure. The upper end of the rodis provided with a roller 10 which engages a stationary cam X, securedagainst rotation onto the end of the pivotal shaft q, in such a mannerthat, as the hopper is swung to and fro, the cam engages and depressesthe roller'and thereby the rod and opens the door U, allowing the sandto escape onto the face of the stone being ground. This cam is arrangedso that the door is closed, while the mouth of the hopper is at or nearthe limits of its stroke, so that the sand escapes only when the hopperis being caused to swing. The cam is preferably made in two sections as,:10, which may be adjusted to lengthen or diminish the time the rollerisdepressed. After the two sections are adjusted to lengthen or shortenthe face of the cam they are secured by asuitable clamp X which extendsthrough slots in the two sections.

' We supply water to the face of the stone being ground in the desiredquantities in any well known or approved manner. f

It is evident that slight changes might be resorted to in the form andarrangement of the several parts, without departing from the spirit andscope of our invention; Hence we do not wish to limit ourselves strictlyto the supporting shaft, means for rotating it, a holder secured to theshaft, a grinding plate secured to the holder to rotate with the shaft,the said grinding plate being widest at its opposite ends and graduallydecreasing in width as it approaches its axis of rotation, as and forthe purpose set forth.

3. In a grinding machine, a grinding plate, means for rotating it and aguard secured to the advancing edge of the grinding platev in positionto direct the sand and water beneath it, substantially as set forth.

4. In a grinding machine, a grinding plate, means for rotating it, and aguard removably secured to the advancing edge of the grinding plate inposition to direct the sand and water beneath it, substantially as setforth.

5. In a grinding machine, a grindingplate, means for rotating it, aguard secured thereto and extending over the edge thereof, and means foradjusting the lower edge of the guard toward and away from the surfaceof the stone being treated, substantially as set forth.

6.. The combination with the grinding plate operating mechanism, of avibrating sanding device under the control of the said grinding plateoperating mechanism, substantially as. set forth. I 7 v 1 7. Thecombination with the grinding plate operating mechanism, of a sandingdevice, and means for intermittently opening and closing the sandingdevice, substantially as set forth.

8. A sanding device, comprising a suitable support, a hopper mounted toswing in the said support, and means for swinging the said hopper atintervals across the face of the stone being treated, substantially asset forth.

9. A sanding device, comprising a suitable support, a hopper having adischarge spout, said hopper mounted to swing on said support, and meansfor regulating the length of throw of the mouth of said spout,substantially as set forth.

10. A sanding device, comprising a suitable support, a shaft secured tothe support, a hopper mounted to swing on the said shaft, a dischargespout extending from the hopper, means for swinging the hopper to andfro, and a device for opening the mouth of the discharge spout duringits swinging movement and holding it closed at the limits of its stroke,substantially as set forth.

RUDOLPH F. EMMERIOH. FREDERICK VONDERLEHR.

Witnesses 2 FREDK. HAYNES, IRENE B. DECKER.

